Burner for ore-sintering.



S. E. FRASER. BURNER FOR ORE SINTERING.

APPLICATION FILED 050.10.1911.

Patented Apr. 9, 1918.

n r aw W m O E A 6 sefr SAMUEL EDGER FRASER, OF PORT PIRIE, SOUTH AUSTRALIA, AUSTRALIA.

BURNER non QEE-SINTERING.

Specification of Letters Patent.

. Patented Apr. 9,1918.

Application filed DecemberlO, 1917. Serial No. 206,530.

Britain, residing at Port Pirie, State of South Australia, Commonwealth of Australia, have invented new and useful Improvements in Burners for Ore-Sintering, of which the following is a specification.

This invention relates to an improved furnace for use with liquid or gaseous fuel in the sintering or roasting or heating of ores or other metalliferous materials and has reference especially to an improved furnace, particularly adapted for use in well known processes of sintering sulfid ores. This invention is especially designed for use with metallurgical processes in which ores and other materials containing combustible matters (such as sulfur) are roasted or sintered by igniting a layer of the material and then withdrawing it from the source of heat and allowing combustion to proceed naturally, the air necessary for combustion being drawn or forced through the material. It will however be understood that I do not limit myself to such applications and that the invention may be adapted to other metallurgical operations. 1

The object of this invention is to provide an improved roaster for use with liquid or gaseous fuel, (hereinafter included in the term fluid fuel) in the metallurgical operations, such as the aforesaid, by which operations, complete and uniform ignition is obtained together with uniform heating of the radiating surface parallel to (and above) the surface of the material to be ignited or heated and also means for the control and regulation of the temperatures and distribution of the heat and the proportion of air to fuel.

I accomplish this object by providing an improved furnace which comprises a chamber formed in a hood or casing of refractory material, such chamber being of circular or elliptical form (hereinafter referred to as rounded) having one or more inlets for the fuel arranged tangential to the periphery of the said chamber, whereby the flames are given a circular or cyclonic path within the said chamber.

In order that this invention may be the better understood I will now proceed to describe the same with reference to the accompanying drawings in which Figure 1 is a plan partly in section of the casing or hood of a furnace constructed according to this invention.

Fig. 2 is a longitudinal section of the same on the line 2--2.

. Fig. 3 is an nd elevation.

Fig. 4 is a cross section.

Fig. 5 is a detail view of the section of the nozzle 8, for the liquid or gaseous fuel.

The hood of my improved furnace consists of a chamber having suitable inlets for the liquid or gaseous fuel whereby the flames are directed therein in a circular or cyclonic path. For this purpose I provide a hood or casing having a roof 1, said casing being composed of refractory materialsuch as firebrick which affords a radiating surface parallel to the surface of the ore charge to be heated. This hood or casing forms a fiat shallow chamber 2 preferably of elliptical shape and (when to be used for sintering as above mentioned) ismade open at the bottom. It is to be understood that the casing shown in Figs. 1 and 2 is to be placed over a horizontally movable hearth, on which the ore or other metalliferous material is to be spread out in the form of a layer, by means well known in the art. The ore charge spread out on such hearth will accordingly represent a layer substantially parallel to the roof 1. One or more inlets 3 for the fuel or heating flame are provided, leading into this chamber tangentially there being preferably two at opposite ends and relatively close to the opposite sides, but the two inlets are not in line with each other. These fuel inlets are provided with suitable means for admixture of air. with the gaseous or liquid fuel so that the'combustion is promoted immediately and the flames caused to follow one another'in a circular or cyclonic path around the said chamber. For this purpose I provide small housings 4 at each end, preferably of wrought iron having sliding shutters 5 for the accommodation of the supply pipes 6 and 7 for the fuel and air leading to the nozzles 8. One of these nozzles is shown more especially in Fig. 5 and comprises two disks 9 and 10 having annular grooves 11 and 12 respectively which enable the fuel and the air to pass around and be delivered together through the outlet 13. The disks 9 and 10 are of refractory material such as firebrick and are bolted together by the bolt 14. The inner surfaces of the sides and top of the chamber become intensely heated with complete combustion of the fuel affording a radiating surface which throws the heat directly downward on to the bed of ore to be ignited orheated.

In addition to the means above mentioned for the admission of air tot-he fuelin the aforesaid inlets (i. 0., shutter 5 and pipe 7) I may also provide one or more holes or apertures 15 in the top of the casing for the admission of additional air to permit of combustion or oxidation of the sulfur and other combustible constituents of the ore charge.

In the operation of the furnace, the flames and products of combustion pass through the open bottom'beneath the sides of the same over the surface of the ore bed. As'many casings or heating chambers are provided as may be necessary to obtain the required length of radiating surface. In this case the burnersto each casing are designed as independent units, so that indi vidual regulationof the heating may-be obtained.

It is to be understood that the invention is not restricted to the specific apparatus illustrated, but is defined by the appended claims.

I claim- 1. A furnace for use with fluid fuel in the heat-treatment of metalliferous materials, said furnace comprising as an element thereof to be placed over a hearth, a hood or casing, inclosing a rounded chamber having an inlet or inlets for the fuel arranged tangential to the periphery of said chamber, so that the flames are given a circular or cyclonic path within the said chamber.

2. In a furnace for use with liquid or gaseous fuel in the sintering or roasting or.

lets forthe fuel arranged tangential to the' periphery thereof, of mixing nozzles arranged to deliver a fluent mixture of fuel and air through the said inlets into the chamber for combustion therein, said inlets being arranged to project the flames in substantially opposite directions, but not in the same line, whereby a cyclonic motion is given to the gases and flames insaid rounded chamber.

4. In a furnace of the class described, a hood provided with a chamber of elliptical horizontal cross section, two tangentially arranged flame inlet passages connected to opposite ends of the ellipse,-delivering in substantially opposite-directions but not in the same line, whereby a cyclonic motion of the gases in such chamber is produced, both of said passages being substantially parallel to the major axis of the ellipse, and means for controlling the fuel and air supplies to each of said inlets.

In a furnace for the roasting or sintcring of metalliferous material, the combination of an openbottomed casing having a' roundedflame chamber therein, a plurality of flame inlets arranged tangentially to said rounded chamber and provided with adjustable air inlets, said flame inlets being situated at oppositeends of said chamber, and out of line with each other, toproduce a cyclonic motion of-the'products of combustion in said chamber.

In testimony whereof I have Signed my name to this specification in-the presence of two subscribing witnesses.

SAMUEL EDGER FRASER.

IVitnesses IV. I. DAVIS, H. C. CAMPBELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

